//: C22:Overhead.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Virtual base class overhead
#include <fstream>
using namespace std;
ofstream out("overhead.out");

class MBase
{
public:
    virtual void f() const {};
    virtual ~MBase() {}
};

class NonVirtualInheritance
            : public MBase {};

class VirtualInheritance
            : virtual public MBase {};

class VirtualInheritance2
            : virtual public MBase {};

class MI
        : public VirtualInheritance,
            public VirtualInheritance2 {};

#define WRITE(ARG) \
out << #ARG << " = " << ARG << endl;

int main()
{
    MBase b;
    WRITE(sizeof(b));
    NonVirtualInheritance nonv_inheritance;
    WRITE(sizeof(nonv_inheritance));
    VirtualInheritance v_inheritance;
    WRITE(sizeof(v_inheritance));
    MI mi;
    WRITE(sizeof(mi));
} ///:~
